This is the 4954th most frequent French word.
soixante
"Sixty."
The word 'soixante' is used as a numerical adjective, describing the quantity of books ('60').
J'ai 60 livres dans ma collection.
I have 60 books in my collection.
'Soixante' specifies the duration in days directly. It functions as a numeral adverbial.
Il a travaillé depuis soixante jours sans pause.
He has been working for sixty days without a break.
Here, 'soixante' refers to a specific decade (the 1960s), serving as a cultural or temporal reference.